{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2008:FZSFXCQJOPPPJB7IUBKM7A25OT","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"a17943323c659831a2e2e295ac15786b3458f62c4329d206291136d1bbc8108f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2008-08-01T17:15:22Z","title_canon_sha256":"9064d5a4bf80d6d1f8484918b92347718fae65591370492023e3f6cb4ed9e47c"},"schema_version":"1.0","source":{"id":"0808.0154","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0808.0154","created_at":"2026-07-04T17:12:12Z"},{"alias_kind":"arxiv_version","alias_value":"0808.0154v3","created_at":"2026-07-04T17:12:12Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0808.0154","created_at":"2026-07-04T17:12:12Z"},{"alias_kind":"pith_short_12","alias_value":"FZSFXCQJOPPP","created_at":"2026-07-04T17:12:12Z"},{"alias_kind":"pith_short_16","alias_value":"FZSFXCQJOPPPJB7I","created_at":"2026-07-04T17:12:12Z"},{"alias_kind":"pith_short_8","alias_value":"FZSFXCQJ","created_at":"2026-07-04T17:12:12Z"}],"graph_snapshots":[{"event_id":"sha256:f7dac21292c99980de8d35893c2e323b8652134ec8eff4d76e94f51d83913af5","target":"graph","created_at":"2026-07-04T17:12:12Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/0808.0154/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We report a versatile method to efficiently polarize single nuclear spins in diamond, which is based on optical pumping of a single NV color center and mediated by a level-anti crossing in its excited state. A nuclear spin polarization higher than 98% is achieved at room temperature for the 15N nuclear spin associated to the NV center, corresponding to $\\mu$K effective nuclear spin temperature. We then show simultaneous deterministic initialization of two nuclear spins (13C and 15N) in close vicinity to a NV defect. Such robust control of nuclear spin states is a key ingredient for further sca","authors_text":"D. Twitchen, F. Jelezko, F. Kaiser, G. Balasubramanian, J. Beck, J. Meijer, J. Wrachtrup, M. Markham, P. Neumann, V. Jacques","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2008-08-01T17:15:22Z","title":"Dynamic polarization of single nuclear spins by optical pumping of NV color centers in diamond at room temperature"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0808.0154","kind":"arxiv","version":3},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:b653f9287c19f49234465749850ef9aa2e3678f44874ec82e6b7faee01c98bf8","target":"record","created_at":"2026-07-04T17:12:12Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"a17943323c659831a2e2e295ac15786b3458f62c4329d206291136d1bbc8108f","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"quant-ph","submitted_at":"2008-08-01T17:15:22Z","title_canon_sha256":"9064d5a4bf80d6d1f8484918b92347718fae65591370492023e3f6cb4ed9e47c"},"schema_version":"1.0","source":{"id":"0808.0154","kind":"arxiv","version":3}},"canonical_sha256":"2e645b8a0973def487e8a054cf835d74fbdd87e340d0b1d54e807771edaf871e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"2e645b8a0973def487e8a054cf835d74fbdd87e340d0b1d54e807771edaf871e","first_computed_at":"2026-07-04T17:12:12.144285Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T17:12:12.144285Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"0LOWBhAA6X7eX34bOxN1YKFprkrGiwTfpjotO65ZzPZ7dYkGfBVHQ4K6YzCs39xTwlyWRFitmeqD8uNO7fV+AA==","signature_status":"signed_v1","signed_at":"2026-07-04T17:12:12.144687Z","signed_message":"canonical_sha256_bytes"},"source_id":"0808.0154","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b653f9287c19f49234465749850ef9aa2e3678f44874ec82e6b7faee01c98bf8","sha256:f7dac21292c99980de8d35893c2e323b8652134ec8eff4d76e94f51d83913af5"],"state_sha256":"b0247ffe6ffb5e4a4e839bc87f521a1dd1c8c94c2c5ffc8278c8dfce986bde0d"}